package cn.jc.springframework.core.io;

import cn.hutool.core.lang.Assert;
import cn.jc.springframework.utils.ClassUtils;

import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;

/**
 * @Description: 处理类路径的资源
 * @author: JC
 * @date: 2023/4/5 14:33
 */
public class ClassPathResource implements Resource{

    private final String path;

    private ClassLoader classLoader;
    public ClassPathResource(String path){
        this(path,(ClassLoader)null);
    }
    public ClassPathResource(String path, ClassLoader classLoader) {
        Assert.notNull(path, "Path must not be null");
        this.path = path;
        this.classLoader = (classLoader != null? classLoader: ClassUtils.getDefaultClassLoader());
    }
    @Override
    public InputStream getInputStream() throws IOException {
        InputStream resourceAsStream = classLoader.getResourceAsStream(path);
        if(resourceAsStream == null){
            throw new FileNotFoundException(
                    this.path + " cannot be opened because it does not exist");
        }
        return resourceAsStream;
    }
}
